166664628 has 60 divisors (see below), whose sum is σ = 469221060. Its totient is φ = 51280128.

The previous prime is 166664611. The next prime is 166664629. The reversal of 166664628 is 826466661.

166664628 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 61027344 + 105637284 = 7812^2 + 10278^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166664629) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15573 + ... + 23996.

It is an arithmetic number, because the mean of its divisors is an integer number (7820351).

Almost surely, 2^166664628 is an apocalyptic number.

166664628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

166664628 is an abundant number, since it is smaller than the sum of its proper divisors (302556432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166664628 is a wasteful number, since it uses less digits than its factorization.

166664628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39598 (or 39587 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 166664628 is about 12909.8655298961. The cubic root of 166664628 is about 550.3189642969.

The spelling of 166664628 in words is "one hundred sixty-six million, six hundred sixty-four thousand, six hundred twenty-eight".